How to refresh Block Preview

Hi all,

I hope you may be able to help me, this is frustrating me a little!

I'm creating a folder in our design library to allow users to be able to quickly put in surface finish indicators quickly and easily. The first problem I encountered is that SW won't leave you add the surface finish symbols to a block. I got around this by creating the blocks in AutoCad and then importing them into SW and saving them as a SW block.

The reason I did this is that I'd like the preview to come up when a user hovers over the block in the design library. If you put in an Autocad file it won't show a preview.

But now I've the problem that the preview is really small and hard to make out, you can see it in the picture attached. Does anyone know of a way to refresh the preview to make the block take up the full preview window like in the second picture below?!

Thanks,

Brian.

SolidworksDrawings And Detailing